Assessing care quality: impact on renal outcomes in non-diabetic chronic kidney disease patients

BACKGROUND: Chronic kidney disease (CKD) is a major global noncommunicable disease, with significant burden on healthcare systems. Quality indicators (QIs) are useful tools for evaluating healthcare quality, but existing QIs for renal care mainly focus on dialysis population. This study aims to explore the association between quality of renal care and outcomes in non-diabetic CKD patients. METHODS: This study utilized Taiwan's National Health Insurance claims data and death registries to enroll non-diabetic adults with advanced CKD (stage 3B-5) from 2016 to 2019, following them through 2020. QIs evaluated included prescription of renin-angiotensin system (RAS) inhibitors, testing for proteinuria, and avoidance of nonsteroidal anti-inflammatory drugs (NSAIDs). An overall quality score was calculated by summing scores of each QI. The primary outcome was long-term dialysis, and secondary outcomes included death, acute kidney injury (AKI), hyperkalemia, and acidosis. Univariate and multivariate Cox proportional hazards models were used to estimate the hazard ratios (HRs) and 95% confidence intervals (CIs) of the effects of QIs on outcomes. RESULTS: Among 27,842 patients, 59.8% received RAS inhibitors, 56.5% underwent proteinuria testing, and NSAIDs were avoided in 97.9% of cases. Only 33.5% received the highest QI score of 3. Multivariate Cox proportional hazard models showed that higher overall quality scores were associated with a lower risk of long-term dialysis (HR 0.87, 95% CI 0.83-0.92), death (HR 0.90, 95% CI 0.86-0.94), and acidosis (HR 0.87, 95% CI 0.79-0.96). Additionally, higher overall quality scores were borderline associated with a lower risk of AKI and hyperkalemia. CONCLUSIONS: QIs for renal care were associated with better outcomes in non-diabetic patients with advanced-stage CKD, particularly in long-term dialysis, death, and acidosis. More patients need to be prescribed RAS inhibitors and tested for proteinuria to achieve better quality of renal care. KEY MESSAGES: • Our study shows quality of renal care can impact outcomes for non-diabetic CKD patients, with higher quality indicator scores associated with lower risk of long-term dialysis, death, and acidosis. • Prescription of RAS inhibitors had the most significant protective effect, but more patients need to be prescribed RAS inhibitors and tested for proteinuria to achieve better renal care quality.